Improvement in hanging grindstones



DAVID HINMAN,

OF BEREA, OHIO.

IMPROVEMENT IN HANGING GRINDSTONES.

Specification forming part of Letters Patent No. l5, 19, dated June 2l,1856.

y To @ZZ whom it may concern.-

or Shafts; and I do hereby declare that the fol-` lowing is a full andexact description of the same,reference being had to the accompanyingdrawings, in which- Figure l represents the molds and stone in place,ready to receive the shaft and crank; Fig. 2,aplan view ofthe bottommold; Figs.3 and 4, the top mold in sections; Fig. 5, a stone hung withthe shaft and crank after the method herein described.

Like letters represent like parts in all the several figures.

The stone A is prepared by any of the ordinary means, with the hole inthe center, and is placed between the molds B C, Fig. l. The lower mold,B, Figs. l and 2, has a circular hole, D, in the center, and connectedwith it is a depression or recess, E. In the circular hole and recess isformed the flange F, and that section of the shaft indicated at G, Fig.5. The upper mold, C, is divided into two equal sections, C C, Figs. 3and 4, through the center of groove, forming the shaft and crank,.sothat one half side of the shaft and crank and flange is in one mold, andthe other half in the other, so that when these two sections aretogether they form a recess, H, corresponding to E, in which is formedthe flange I, and the crank J in J J. The section K of the shaft isformed in the groove M, Figs. 3 and 4. In the section C are two dowels,N N, which fit into the holes N so that the section will always be inthe proper position when the shaft is being attached to the stone. Themold may also be held by a clamp on the outside. The stone, beingprepared, is placed upon its side on the lower mold, B, and the uppermold, C, is placed on the upperside of the stone, as seen in Fig. l. Arod of suitable size is passed down through the hole L and through theeye ofthe stone into the hole D of the lower mold. By this means thestone is lined so that the stone and shaft will be true with each other,as the groove in the molds in which the shaft is formed is trued withthe face of the molds l which come in contact with the stone, so thatthe stone will run perfectly true upon the shaft. After the stone is inthe desired position between the molds the plug O is passed into thehole L, as seen in Fig. 1. Any molten metal suitable for such purpose isthen poured into the sprue-hole at P, and runs down through the cavity of the upper mold. through the eye of the stone, and into the cavity ofthe lower mold. By this means the entire shaft and crank,-with theflanges on each side of the stone, is formed at once, and by thecontraction of the metal in cooling the flanges firmly hold the stone inplace on the shaft. The plug O prevents the metal from rising any higherin the mold than the outside of the crank.

rIhe centering or truing rod described,which passes down through thehole L and eye of the stone and into the hole D of the lower mold,may beof such size as to allow the molten metal to run around this rod when inthe eye of the stone and in the mold, so that it will the eye of thestone; or when the stone is trued with the mold by a truing-rod, asmaller one, as represented by the dotted lines at b, Fig. l, may beinserted in its place, and the meta cast around it, as described.

The dotted lines a -in Fig. 1 indicate the cavities of molds in whichthe shaft, flanges, and crank are formed and connected'to the stone.After the metal in the cavities of the easily separated from thc stone,shaft, and crank.

Fig. 5 represents the shafts, flanges, and

stone.

Vhat I claim as new, and for which I desire to secure Letters Patent,is-

described, having the shaft and flange with or without a crank cast inone piece, with the stone firmly secured thereto by the shrinking of themetal, as set forth.

f DAVI D H INMAN.

Witnesses:

I. B. J oHNsoN, NV. H. BURRIDGE.

form the journals and center of the shaft in y,

molds has become cooled the molds may be crank detached from the moldssecured to the Hanging grindstones, in the manner herein

